I know alot of others have had great experiences with chemiclean but not in my case. Ive used it on 2 different occasions. The first time I did back to back treatments and afterwards I experienced a lot of stn and coral loss. I thought that maybe it was due to me doing back to back treatments. I tried it again maybe a year or so later with one treatment and experienced the same stn and loss. Both times my skimmer went nuts for right at a week, had to run it wide open. I threw the bottle in the trash and will never use it again. I guess every system is different and reacts differently with treatments.
Jeff